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The screening ­equipment, used by police and the NHS, turns blue to indicate traces of powder or crack cocaine crystals.

The company behind the ­equipment say the tests ­“presumptively identify cocaine from trace amounts of residue present on surfaces that have been in contact with cocaine or handled with contaminated hands”.

Forensic lab tests to confirm the presence of the drug are yet to be carried out.

The Mirror passed on the ­information to royal officials and health bosses.

Kensington Palace said tonight that it was “a matter for the hospital”.

They have already been in place for more than two weeks as the world’s media gather to report on the birth.

Kate was spotted out and about driving on Tuesday with no sign of being in labour.

She had recently told supporters on an official engagement she was due “mid to late April”.

Westminster Council has confirmed that the parking ­restrictions will stay in place until May 5.

It came amid speculation today that Kate had been swimming at Buckingham Palace’s pool to help bring on labour naturally.

She was spotted arriving at the royal residence for the second day running.

Bookies have shortened odds on the baby being born in May to 4/5.

Coral’s Nicola McLean said: “Odds suggest the royal baby wait will continue into May, and after a ­photograph emerged of the duchess driving, punters are rushing to bet on the wait lasting longer than expected.”

Alice is the bookies’ favourite name for the new tot, followed by ­Charlotte and Elizabeth. Seven out of the top 10 ­predictions going are girls’ names.

Phillip has overtaken Henry as the third favourite boy’s name, with James and Arthur in first and second place.

The baby will be ­delivered by royal gynaecologists Guy Thorpe-Beeston and Alan Farthing. The pair helped bring little George, who was three days late, into the world.

William and Kate today ­celebrated their fourth wedding ­anniversary. The couple thanked the “superfans” camped outside the hospital.

Try your hand at our daily news quiz:

Question -1 of 5Score -0 of 0

According to a new poll by Ipsos MORI what percentage of the Scots support Labour?